Fire-door for steam-boilers.



C. BDGERTON. FIRE DOOR FOR STEAM BOILERS. APPLICATION IILED JULY30,1914.

Patented N0v.v17, 1914.

YNE NORRIS PETERS 60., PHOMLITHQ. WASHINGTON, D. c

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CHARLES EDGERTON, OF PHILADELPHIA, PENNSYLVANIA.

FIRE-DOOR FOR STEAM-BOILERS.

To all whom it may concern:

Be it known that I, CHARLES EDGERTON, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Fire-Door for Steam-Boilers, of which the following is a specification.

My invention relates to steam boiler fire doors which open through the water leg formed between the outer shell and the fire box wall. Difficulty has been experienced in connecting the outer shell to the fire box wall around the door so that it will stand the alternating strains of expansion and contraction. Such openingsare peculiarly subject to variable temperatures, owing to the frequent opening of the door and the metal rapidly deteriorates by crystallization and cracking. The customary way of mak ng the connection at this point is to put a ring of solid metal between the sheets composing the fire box and shell and riveting it in place all around. This ring would either crack or make such a thickness of material that the edges of the shell would crack from the rivets out. Various means to overcome these difliculties have been provided, among which is to flange the outer shell inwardly and flange the fire box wall outwardly and rivet the two flanges together.

My invention provides a new means for connecting these parts which relieves the heretofore named ditliculties and makes a fire door of simple and cheap construction and great longevity, which I will now proceed to describe with reference to the drawing, in which:

Figure l is a front elevation of the lower part of an upright steam boiler showmg merely the door opening. Fig. 2 is an enlarged horizontal section, in detail, on line 22 of Fig. 1. Fig. 3 is a partial vertlcal section through the fire door, showing also my telescopic protecting shield and the fire door complete and Fig. i is a sectional detail, showing the telescopic protecting shield for fire door made separate from the door frame.

In the drawing, Fig. 1, A represents the fire door, here shown as oval and opening through both the outer boiler shell B and the fire box wall C, the latter being provlded with the usual crown sheet F and being surrounded by a water leg.

In forming the fire door opening, see Fig.

Specification of Letters Patent.

Application filed July 30, 1914.

Patented Nov. 17, 1914.

Serial No. 854,111.

'2, the outer shell 13 is bent inwardly around the opening to form flange Z) substantially at right angles to the shell, and the fire box wall C is bent outwardly around the door opening to form the flange c, the flanges b and 0 being of equal contour and abutting against each other, and being beveled, as seen at (Z, at the meeting point. A metal ring G previously fitted to place is then shrunk on the outside of the flanges within the water space. The edges of the flanges are then welded together and also to the ring G by means of the oxy-acetylene blow pipe process. This fuses the flanges and ring together integrally without joint or rivet and makes a solid and unitary structure as strong as any other portion of the boiler and, in addition, is reinforced all around as shown. It will be seen, therefore, that the water gets to the sheets entirely around the door to keep it cool, having only the thickness of the ring in addition to the thickness of the sheet, and, as there are no rivets to tear out and no severe strains of expansion and contraction, greatlongevity is imparted to this part of the boiler.

In order that the value of the reinforcing ring G may be better understood, I will state that the two edges of the two structures which are to be welded together are brought together as closely as practicable. The steel ring or band is shrunk on to one side and in putting them together is shrunk on to the other side. In welding by the process described every portion of the two edges of these structures is fused and welded to the reinforcing ring, making it a complete structure. \Vithout a backing like the ring G the melted metal runs through and away and makes trouble and imperfect work. The ring corrects this trouble and also greatly strengthens the structure. As a further protection, I provide, as seen in Fig. 3, a stationary telescopic shield h which extends in through the fire door opening all around its circumference to the inner wall of the fire box. This shield in Fig. 3 is cast as a part of the door frame II which carries the door I and is riveted to the outer shell. The function of this shield h is to prevent the cold draft of air, sucked in when the door is opened, from striking the hot boiler surfaces around the tire door, thus further reducing alternating strains of expansion and contraction. This protecting shield has a special correlated value and coordinated effect with the welded joint, in that it relieves that joint of any such high temperatures and variable strains as might affect the stability and union of such welded joint.

Instead of casting the shield h in one and the same piece with the door frame H, these parts may be made in separate pieces, so that the shield may be replaced without requiring a whole new door frame, as seen at h in Fig. l. In such case the outer edge of the shield is made slightly flaring or flanged, to keep it from moving inwardly when clamped in place by the door frame against the edges of the door opening in the boiler casing.

It will be understood that my improvements in fire doors are applicable not only to upright boilers, but also to locomotive boilers and all boilers where the fire door opens through a water leg or water space.

What I claim is:

1. A fire door for steam boilers constructed of an outer shell and fire boX wall each formed with an opening having flanges extending toward each other to abutting contact and united integrally without joint or rivets, and a reinforcing ring embracing the flanges within the water space.

2; A fire door for steam boilers constructed of an outer shell and fire box wall each formed with an opening having flanges ex tending toward each other to abutting contact and united integrally without joint or rivets, and a reinforcing ring embracing the flanges within the water space and also united integrally with the flanges.

3. A fire door for water leg steam boilers having a stationary protecting telescopic shield extending inwardly all around and through the opening to the inner wall of the water space.

l. A fire door for water leg steam boilers having a stationary protecting telescopic shield extending inwardly all around and through the opening to the inner wall of the water space, said shield being made separate from they door frame to permit it to be replaced independently of the door frame.

A fire door for steam boilers constructed of an outer shell and fire box wall each formed with an opening having flanges. extending toward each other to abutting contact and connected together, and a door frame having a stationary protecting telescopic shield extending continuously all around the opening to the inner wall of the water space.

6. A fire door for steam boilers constructed of an outer shell and fire boX wall each formed with an opening having flanges eX- tending toward each other to abutting contact and connected together, and a door frame having a stationary protecting telescopic shield extending continuously all around the opening to the inner wall of the water space, and a reinforcing ring embracing the connected flanges within the Water space.

7. A fire door for steam boilers constructed of an outer shell and fire boX wall each formed with an opening having flanges eX- tending toward each other to abutting contact and welded together, and a door frame having a stationary protecting telescopic shield extending continuously all around the opening to the inner wall of the water space.

In testimony whereof I affi-X my signature in presence of two witnesses;

CHARLES EDGERTOIT;

Witnesses:

CHRISTIAN PFEIFFER, Jr., GEORGE LEE Rorn, C. E.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

